CN117917171A - Terminal and wireless communication method - Google Patents

Abstract

The terminal has: a transmitting unit that repeatedly transmits a message during random access channel; and a control unit that sets a random access resource according to whether or not the repeated transmission and the quality threshold for the repeated transmission are applied.

Description

Terminal and wireless communication method

Technical Field

The present disclosure relates to a terminal and a wireless communication method that cope with repetition of messages in a random access channel procedure.

Background

The third generation partnership project (3rd Generation Partnership Project:3GPP) standardizes the fifth generation mobile communication system (also referred to as 5G, new radio: NR), or Next Generation (NG)), and further, the next generation, referred to as beyond 5G, 5G event, or 6G, has also been advanced.

For example, in 3GPP Release-17, work item (work item) related to coverage enhancement in NR (CE: coverage Enhancement) is agreed (non-patent document 1).

Specifically, a study was made on the specification of Repetition (Repetition) of an Uplink data channel (PUSCH: physical Uplink SHARED CHANNEL) used for transmission of a message (Msg 3) of a Random access channel (RACH (Random ACCESS CHANNEL) procedure).

Prior art literature

Non-patent literature

Non-patent document 1: REVISED WID on NR coverage enhancements, RP-211566,3GPP TSG RAN meeting#92e,3GPP,2021, month 6

Disclosure of Invention

In the case of the Repetition of the message (Msg 3) supporting the RACH procedure, there is considered to be room for improvement with respect to the specific operation of the terminal (User Equipment: UE) related to the Repetition.

For example, a report on RACH procedure in the case of supporting Repetition and RACH procedure failure requires a more appropriate action corresponding to Repetition by the UE.

Accordingly, the following disclosure is made in view of such a situation, and an object thereof is to provide a terminal and a wireless communication method as follows: a more appropriate action can be performed with respect to the Repetition of the message (Msg 3) of the RACH procedure.

One aspect of the present disclosure is a terminal (UE 200), the terminal (UE 200) having: a transmitting unit (wireless signal transmitting/receiving unit 210) that repeatedly transmits a message during a random access channel; and a control unit (control unit 270) that sets a random access resource according to whether or not the repeated transmission is applied and a quality threshold for the repeated transmission.

One aspect of the present disclosure is a terminal (UE 200), the terminal (UE 200) having: a transmitting unit (wireless signal transmitting/receiving unit 210) that repeatedly transmits a message during a random access channel; and a control unit (control unit 270) that generates a random access report including information on the quality threshold for repeated transmission when the random access channel procedure fails during the repeated transmission.

One mode of the present disclosure is a wireless communication method including the steps of: repeatedly sending information in the random access channel process; and setting a random access resource according to whether the repeated transmission is applied or not and a quality threshold for the repeated transmission.

One mode of the present disclosure is a wireless communication method including the steps of: repeatedly sending information in the random access channel process; and generating a random access report including information on a quality threshold for the repeated transmission when the random access channel procedure fails in the repeated transmission.

Drawings

Fig. 1 is a schematic overall configuration diagram of a wireless communication system 10.

Fig. 2 is a diagram showing a configuration example of a radio frame, a subframe, and a slot used in the wireless communication system 10.

Fig. 3 is a functional block configuration diagram of the gNB 100 and the UE 200.

Fig. 4 is a diagram showing an example of random access timing including Repetition of Msg 3.

fig. 5 is a diagram showing an example of random access sequence including initial transmission (initial transmission) and retransmission (re-transmission) of msg 3.

Fig. 6 is a diagram schematically showing a conventional 4-step RACH procedure.

Fig. 7 is a diagram schematically showing the RACH procedure of operation example 1.

Fig. 8 is a diagram showing an outline of the RACH procedure (when the RACH is retracted from the 2-step RACH to the 4-step RACH) of operation example 1.

Fig. 9 is a diagram showing an example of a hardware configuration of the gNB 100 and the UE 200.

Detailed Description

Embodiments will be described below with reference to the drawings. The same or similar functions or structures are denoted by the same reference numerals, and description thereof is omitted as appropriate.

(1) Overall outline structure of radio communication system

Fig. 1 is a schematic overall configuration diagram of a radio communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to a new air interface (new radio: NR) of 5G, and includes a next generation radio access network 20 (next generation-Radio Access Network, hereinafter referred to as NG-RAN 20) and a terminal 200 (user equipment 200, hereinafter referred to as UE 200).

The wireless communication system 10 may be a wireless communication system according to a scheme called Beyond 5G, 5G event, or 6G.

The NG-RAN 20 includes a radio base station 100A (hereinafter referred to as a gNB 100). In addition, the specific structure of the wireless communication system 10 including the number of gnbs and UEs is not limited to the example shown in fig. 1.

The NG-RAN 20 actually comprises a plurality of NG-RAN nodes, in particular gnbs (or NG-enbs), connected to a core network (5 GC, not shown) according to 5G. In addition, the NG-RAN 20 and 5GC may also be simply expressed as a "network".

The gNB 100 is a radio base station according to NR, and performs radio communication according to NR with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO (Massive MIMO) that generates a beam BM having higher directivity by controlling wireless signals transmitted from a plurality of antenna elements, carrier Aggregation (CA) that bundles a plurality of Component Carriers (CCs), dual Connection (DC) that simultaneously communicates between the UE and a plurality of NG-RAN nodes, respectively, and the like.

The wireless communication system 10 supports FR1 and FR2. The Frequency bands of each FR (Frequency Range) are as follows.

·FR1：410MHz～7.125GHz

·FR2：24.25GHz～52.6GHz

In FR1, a subcarrier spacing (Sub-CARRIER SPACING: SCS) of 15kHz, 30kHz or 60kHz is used, and a Bandwidth (BW) of 5 to 100MHz can be used. FR2 is a higher frequency than FR1, and SCS of 60kHz or 120kHz (240 kHz may be included) may be used, and Bandwidth (BW) of 50 to 400MHz may be used.

Further, the wireless communication system 10 may support a higher frequency band than the frequency band of FR 2. Specifically, the wireless communication system 10 can support frequency bands exceeding 52.6GHz and up to 114.25 GHz.

In addition, cyclic prefix orthogonal frequency division multiplexing (cyclic prefix-Orthogonal Frequency Division Multiplexing: CP-OFDM)/discrete Fourier transform spread orthogonal frequency division multiplexing (Discrete Fourier Transform-spread: DFT-S-OFDM) with larger sub-CARRIER SPACING (SCS) may also be applied. Further, DFT-S-OFDM can be applied not only to Uplink (UL) but also to Downlink (DL).

Fig. 2 shows an example of the structure of radio frames, subframes, and slots used in the wireless communication system 10.

As shown in fig. 2, 1 slot is composed of 14 symbols, and the larger (wider) the SCS is, the shorter the symbol period (and slot period) is. The number of symbols constituting 1 slot may not be 14 symbols (e.g., 28 symbols, 56 symbols). In addition, the number of slots per subframe may also be different according to SCS. Furthermore, the SCS may be wider than 240kHz (e.g., 480kHz, 960kHz as shown in FIG. 2).

The time direction (t) shown in fig. 2 may be referred to as a time domain, a symbol period, a symbol time, or the like. In addition, the frequency direction may also be referred to as a frequency domain, a resource block, a subcarrier, BWP (Band WIDTH PART: wideband portion), or the like.

The wireless communication system 10 is capable of supporting coverage enhancement (CE: coverage Enhancement) that enlarges the coverage of the cell (or physical channel as well) formed by the gNB 100. In the coverage enhancement, a structure for improving the reception success rate of various physical channels may be provided.

For example, the gNB 100 can support repeated transmission of PDSCH (Physical Downlink SHARED CHANNEL: physical downlink shared channel), and the UE 200 can support repeated transmission of PUSCH (physical uplink SHARED CHANNEL: physical uplink shared channel).

In addition, in the wireless communication system 10, a plurality of UEs 200 may be used. For example, as the UE 200, there are various terminals having different functions, performances, and the like, or different supported 3GPP releases. The terminal (UE) may also be referred to as a1 st terminal and a2 nd terminal. The category may be replaced with other terms such as generation and version. Terminals 1 and 2 may also be referred to as enhanced UE (enhanced UE) and legacy ues (legacy ues), respectively. It can also be interpreted that the enhanced UE is the UE supporting the latest version of 3GPP, and the legacy UE is the UE not supporting the latest version.

In the wireless communication system 10, a time slot setting mode (Slot Configuration pattern) of Time Division Duplexing (TDD) may be set. For example, DDDSU (D: downlink (DL) symbol, S: DL/Uplink (UL) or guard symbol, U: UL symbol) may be specified (refer to 3GPP TS 38.101-4).

"D" represents a slot in which DL symbols are all included, and "S" represents a slot in which DL, UL and guard symbols (G) are mixed. "U" indicates a slot that all contains UL symbols.

(2) Functional block structure of radio communication system

Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the UE 200 will be described. Fig. 3 is a functional block configuration diagram of the gNB 100 and the UE 200.

As shown in fig. 3, the UE 200 includes a radio signal transmitting/receiving unit 210, an amplifier unit 220, a modem unit 230, a control signal/reference signal processing unit 240, an encoding/decoding unit 250, a data transmitting/receiving unit 260, and a control unit 270.

Note that fig. 3 shows only main functional blocks related to the description of the embodiment, and it is desirable to note that UE 200 (gNB 100) has other functional blocks (e.g., a power supply unit, etc.). Fig. 3 shows a block structure of the functionality of the UE 200, and with respect to the hardware structure, reference is desirably made to fig. 9.

The radio signal transmitting/receiving section 210 transmits/receives a radio signal according to NR. The wireless signal transmitting/receiving unit 210 can support Massive MIMO that generates a beam having higher directivity by controlling wireless (RF) signals transmitted from a plurality of antenna elements, carrier Aggregation (CA) that bundles a plurality of Component Carriers (CCs), dual Connection (DC) that simultaneously communicates between a UE and 2 NG-RAN nodes, and the like.

Further, the wireless signal transmitting/receiving section 210 may transmit a physical uplink shared channel. Specifically, the radio signal transmitting/receiving unit 210 may transmit PUSCH to the network (gNB 100).

The radio signal transmitting/receiving section 210 may support repeated transmission (repetition) of PUSCH.

The repeated transmission of PUSCH may define a plurality of categories. Specifically, a repetition type A (Repetition type A) and a repetition type B (Repetition type B) may be specified. Repetition type A can be interpreted as a form of repeatedly transmitting PUSCH allocated in a slot. That is, PUSCH is 14 symbols or less, and cannot be allocated across a plurality of slots (adjacent slots).

On the other hand, repetition type B can be interpreted as repeated transmission of PUSCH possibly allocated with PUSCH of 15 symbols or more. In the present embodiment, such PUSCH is allowed to be allocated across a plurality of slots.

Further, the radio signal transmitting/receiving section 210 may transmit a Random access preamble as a 1 st message (hereinafter referred to as Msg 1) in a Random access channel procedure (hereinafter referred to as RACH (Random ACCESS CHANNEL: random access channel) procedure).

The radio signal transmitting/receiving section 210 may receive a2 nd message (hereinafter referred to as Msg 2) as a response message (random access response (RAR)) to Msg1 in the RACH procedure.

The radio signal transmitting/receiving unit 210 may transmit a3 rd message (hereinafter referred to as Msg 3) via PUSCH in RACH procedure after receiving Msg 2.

The radio signal transmitting/receiving section 210 may receive a 4 th message (hereinafter referred to as msg 4) as a response message (3GPP TS38.321 V16.2.1 ≡ 5.1"Random Access procedure (random access procedure)") to msg3 in the RACH procedure.

For example, msg1 may also be transmitted via a PRACH (Physical Random ACCESS CHANNEL: physical Random Access channel). Msg1 may also be referred to as a PRACH Preamble (PRACH Preamble). Msg2 may also be transmitted via PDSCH. Msg2 may also be referred to as RAR (Random Access Response: random access response). Msg3 may also be referred to as an RRC connection request (RRC Connection Request). Msg4 may also be referred to as RRC connection setup (RRC Connection Setup).

In addition, msg3 may also be referred to as PUSCH scheduled by RAR UL grant (RAR UL grant) or PUSCH scheduled by DCI scrambled by a temporary cell-radio network temporary identifier (DCI scrambled by Temporary Cell-Radio Network Temporary Identifier (TC-RNTI)).

The radio signal transmitting/receiving section 210 performs repeated transmission of Msg 3. In the present embodiment, the radio signal transmitting/receiving unit 210 may be configured as a transmitting unit that repeatedly transmits a message during random access channel. The details of the repeated transmission of Msg3 will be described later.

The amplifier unit 220 is configured by PA (power amplifier)/LNA (Low Noise Amplifier: low noise amplifier) or the like. The amplifier unit 220 amplifies the signal output from the modem unit 230 to a predetermined Power level (Power level). The amplifier unit 220 amplifies the RF signal output from the wireless signal transmitting/receiving unit 210.

The modem unit 230 performs data modulation/demodulation, transmission power setting, resource block allocation, and the like for each predetermined communication destination (gNB 100, etc.). Also, Cyclic Prefix-Orthogonal Frequency Division Multiplexing(CP-OFDM)/Discrete Fourier Transform-Spread(DFT-S-OFDM). can be applied to the modem unit 230, and DFT-S-OFDM can be used not only for Uplink (UL) but also for Downlink (DL).

The control signal/reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200.

Specifically, the control signal/reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, control signals of a radio resource control layer (RRC). The control signal/reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

The control signal/reference signal processing unit 240 performs processing using Reference Signals (RSs) such as a Demodulation reference signal (DMRS) and a phase tracking reference signal (PHASE TRACKING REFERENCE SIGNAL: PTRS).

DMRS (demodulation reference signal) is a reference signal (pilot signal) known between a terminal-specific base station and a terminal for estimating a fading channel used for data demodulation. PTRS is a reference signal dedicated to a terminal for the purpose of estimating phase noise that is a problem in a high frequency band.

The reference signals may include, in addition to DMRS and PTRS, a channel state Information reference signal (CHANNEL STATE Information-REFERENCE SIGNAL: CSI-RS), a Sounding reference signal (Sounding REFERENCE SIGNAL: SRS), and a Positioning reference signal for position Information (Positioning REFERENCE SIGNAL: PRS).

In addition, the channels include control channels and data channels. The control channel may include a PDCCH (Physical Downlink Control Channel: physical downlink control channel), a PUCCH (Physical Uplink Control Channel: physical uplink control channel), a RACH (random ACCESS CHANNEL (random access channel), downlink control information (Downlink Control Information: DCI) including a random access radio network temporary identifier (Random Access Radio Network Temporary Identifier: RA-RNTI)), and a physical broadcast channel (Physical Broadcast Channel: PBCH), etc.

The data channel includes PDSCH (Physical Downlink SHARED CHANNEL: physical downlink shared channel), PUSCH (physical uplink SHARED CHANNEL: physical uplink shared channel), and the like. Data may mean data transmitted via a data channel.

The control signal/reference signal processing unit 240 may transmit capability information of the UE 200 related to allocation of a Physical Uplink Shared Channel (PUSCH) to the network.

Specifically, the control signal/reference signal processing unit 240 may transmit UE capability information (UE Capability Information) related to PUSCH allocation (which may include repetition) to the gNB 100.

The control signal/reference signal processing unit 240 may transmit DMRS so that joint channel estimation (Joint channel estimation) can be performed between specific PUSCHs, PUCCH, or PUSCH and PUCCH (described below). The period at this time may be referred to as a time domain window (Time domain window).

The control signal/reference signal processing unit 240 may transmit a random access report (RA-report) to the network. RA-report may contain results related to RACH procedure, etc., or may contain a quality threshold (RSRP (REFERENCE SIGNAL RECEIVED Power: reference signal received Power) applied in RACH procedure, etc.).

The encoding/decoding section 250 performs division/concatenation of data, channel encoding/decoding, and the like according to a predetermined communication destination (gNB 100 or other gnbs).

Specifically, the encoding/decoding section 250 divides the data outputted from the data transmitting/receiving section 260 into predetermined sizes, and performs channel encoding on the divided data. The encoding/decoding unit 250 decodes the data output from the modem unit 230, and concatenates the decoded data.

The data transmitting/receiving section 260 transmits/receives protocol data units (Protocol Data Unit: PDU) and service data units (SERVICE DATA Unit: SDU). Specifically, the data transmitting/receiving section 260 performs assembly/disassembly of PDUs/SDUs in a plurality of layers (medium access control layer (MAC), radio link control layer (RLC), packet data convergence protocol layer (PDCP), etc.), and the like. The data transceiver 260 performs error correction and retransmission control of data according to hybrid ARQ (Hybrid automatic repeat request: hybrid automatic repeat request).

The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 executes control related to Repetition of PUSCH for Msg3 (hereinafter, appropriately omitted as Msg3 PUSCH).

Specifically, the control unit 270 may set the random access resource according to whether or not the repeated transmission of the message in the RACH procedure is applied and the quality threshold for the repeated transmission. For example, when a retransmission of another RACH procedure such as Msg3 (may be a message of msg.a) is provided, the control unit 270 may set RACH resources to be used according to a quality threshold (may also be referred to as rsrp-ThresholdSSB for MSG PUSCH retransmission) for Msg 3.

The quality threshold (rsrp-ThresholdSSB for MSG3 PUSCH repetition) may be set to be lower (worse) than the quality threshold (rsrp-ThresholdSSB) for a synchronization signal block (SSB (Synchronization Signal: synchronization signal)/PBCH (Physical Broadcast CHannel: physical broadcast channel) block)) in the case where repeated transmission is not applied.

The control unit 270 may set the random access resource according to whether the random access channel procedure is 2 or 4 steps. Specifically, when the RACH procedure is returned from the 2-step RACH to the 4-step RACH (2-step RACH), the control unit 270 may set the random access resource by changing the content of the RA procedure according to whether or not retransmission of Msg3 is applied.

In the case that the RACH procedure fails in retransmission of Msg3, the control section 270 may generate a random access report (RA-report) including information on a quality threshold (rsrp-ThresholdSSB for MSG3 PUSCH retransmission) for Msg 3. Specifically, the control unit 270 may include rsrp to ThresholdSSB for MSG PUSCH repetition in RA-report, and transmit the RA-report from the control signal/reference signal processing unit 240.

(3) Operation of a wireless communication system

Next, an operation of the wireless communication system 10 will be described. Specifically, an operation related to the Repetition of the message (Msg 3) of the RACH procedure will be described.

(3.1) Precondition

Fig. 4 shows an example of random access timing including Repetition of Msg3. As shown in fig. 4, the UE 200 first transmits Msg1 (gNB 100) to the NG-RAN 20 according to the RACH procedure. As described above, msg1 may also be referred to as a random access preamble.

The UE 200 receives Msg2 corresponding to Msg1 from the NG-RAN 20. The UE 200 sends Msg3 corresponding to Msg2 to the NG-RAN 20. As shown in fig. 4, msg3 may be repeatedly transmitted. Although not shown, msg1 and the like may be repeatedly transmitted.

The UE 200 may receive Msg4 for either of the Msg3 from the NG-RAN 20. The UE 200 may send an acknowledgement (HARQ (Hybrid Automatic repeat request: hybrid automatic repeat request) -ACK) for msg4 to the NG-RAN 20.

fig. 5 shows an example of random access timing including initial transmission (initial transmission) and retransmission (re-transmission) of msg 3.

As shown in fig. 5, in the 3GPP specifications, re-transmission of Msg3 is specified. Re-transmission of msg3 may be performed in case initial transmission of msg3 fails (cannot be received at the network side).

Regarding re-transmission of msg3, resources may also be allocated through DCI format 0_0with CRC scrambled by TC-RNTI (DCI format 0_0 CRC-scrambled with TC-RNTI).

The Repetition of PUSCH used in the transmission of Msg3 (which may contain re-transmission) may be associated with PUSCH Repetition of Type a.

As the existing PUSCH mapping Type (PUSCH MAPPING TYPE), there are Type a and Type B. Type A is used only for repetition Type A and type B can be used for both repetition Type A and repetition Type B. In the existing type A and type B, allocation in units of slots is envisaged, and thus the value of L does not exceed "14" (number of symbols) (refer to ≡6.1.2 of 3GPP TS38.214 V16.2.0).

Fig. 6 shows a schematic of an existing 4-step RACH procedure. Specifically, fig. 6 shows a RACH resource selection procedure according to a 4-step contention-type random access procedure (CBRA).

As shown in fig. 6, the UE 200 determines the quality of the beam BM of the DL according to rsrp-ThresholdSSB (quality threshold), and the selection method of the beam BM may be different (the type of the rectangular frame line representing the quality level of the DL beam quality corresponds to the line type of the flow block) (hereinafter the same).

(3.2) Working example 1

Fig. 6 shows a schematic of a conventional 4-step RACH procedure, but when retransmission of the Msg3PUSCH is introduced, the RACH procedure is changed. In this operation example, a RACH procedure in the case of retransmission of the Msg3PUSCH is described.

Fig. 7 shows a schematic of the RACH procedure of operation example 1. Specifically, fig. 7 shows a RACH resource selection procedure (RACH resource selection procedure) (4-step contention based RACH: 4-step contention-based RACH) incorporating MSG3 PUSCH repetition.

As shown in fig. 7, the UE 200 may determine the quality of SSB (or may be replaced with a beam) by using, in addition to rsrp-ThresholdSSB, rsrp-ThresholdSSB (rsrp-ThresholdSSB for MSG3 PUSCH Repetition) for Msg3 PUSCH Repetition, and further, determine RACH procedure as a random access resource.

Fig. 8 shows a schematic of the RACH procedure of operation example 1 (during the back-off from the 2-step RACH to the 4-step RACH). Specifically, FIG. 8 shows RACH resource selection procedure (when backing off from 2-step RACH to 4-step RACH) with MSG3 PUSCH repetition introduced.

As shown in fig. 8, the UE 200 may determine the quality of SSB by using msgA-RSRP-Threshold and RSRP-ThresholdSSB for MSG PUSCH repetition, and determine RACH procedure as a resource for random access.

Specifically, the UE 200 may select 2-step RACH or 4-step RACH according to msgA-RSRP-Threshold and RSRP-ThresholdSSB for MSG3 PUSCH Repetition, and in the case of 4-step RACH, may select RACH procedure for Repetition of Msg3 PUSCH or normal RACH (4-step common RACH: 4-step common RACH) procedure to which the Repetition is not applied.

(3.3) Working example 2

In this operation example, an example of RA-report content in the case where retransmission of the Msg3 PUSCH is introduced in the RACH procedure will be described. In particular, an example of the contents of RA-report in the case of RACH failure will be described.

The UE 200 may report RA-report to the network containing the following.

An indication of whether the DL beam (SSB) quality associated with the random access attempt is lower than the new rsrp-ThresholdSSB for MSG3PUSCH repetition .(An indication showing whether DL beam(SSB)quality associated to the random access attempt is below the new rsrp-ThresholdSSB for MSG3 PUSCH repetition or not.)

An indication indicating whether the DL beam (SSB) quality associated with a random access attempt at UE fallback from 2-step RACH to 4-step RACH is lower than the new rsrp-ThresholdSSB for MSG3 PUSCH repetition .(An indication showing whether DL beam(SSB)quality associated to the random access attempt is below the new rsrp-ThresholdSSB for MSG3 PUSCH repetition or not while UE fallback from 2-step RACH to 4-step RACH.)

An indication of when to trigger MSG3 PUSCH repetition if there is any other beam with a quality (RSRP) below RSRP-ThresholdSSB but above RSRP-ThresholdSSB for MSG3 PUSCH repetition (An indication showing when MSG3 PUSCH repetition is triggered,if there is any other beams whose quality(RSRP)is lower than rsrp-ThresholdSSB but higher than rsrp-ThresholdSSB for MSG3 PUSCH repetition.)

An indication indicating whether or not MSG3 PUSCH repetition is triggered. (An indication showing WHETHER MSG PUSCH repetition IS TRIGGERED or not.)

Indication indicating whether MSG3 PUSCH repetition is triggered when UE is backing from 2-step RACH to 4-step RACH .(An indication showing if MSG3 PUSCH repetition is triggered or not while UE fallback from 2-step RACH to 4-step RACH.)

DL beam quality (RSRP) when MSG3 PUSCH repetition is triggered

Number of MSG3 PUSCH repetitions when MSG3 PUSCH repetition is triggered

An indication indicating whether the UE received MSG4 after MSG3 PUSCH repetition. (An indication showing whether UEreceived the msg4 or not AFTER THE MSG PUSCH repetition.)

Indication indicating triggering RACH MSG3 PUSCH repetition when RACH priority is set .(An indication showing RACH MSG3 PUSCH repetition is triggered while RACH prioritization is configured.)

Indication indicating triggering RACH MSG3 PUSCH repetition when slice-based RACH priority is set .(An indication showing RACH MSG3 PUSCH repetition is triggered while slice based RACH prioritization is configured)

An indication that MSG3 PUSCH repetition for RedCap UE (1 RX or 2RX branches) is triggered. (An indication showing MSG PUSCH repetition IS TRIGGERED for RedCap UE (1RX or 2RX branch))

RedCap UE can be interpreted as categories of ues used in industrial wireless sensor (factory sensor), video surveillance (video surveillance), and wearable (wearable terminal), for example. Or RedCap UE may not necessarily reduce the capability, but may also be interpreted as ues for URLLC (ultra-Reliable and Low Latency Communications: ultra-reliable and low latency communication) or for IoT (Internet of Things: internet of things), etc. RedCap UE may also be referred to as UEs of a specific kind.

(4) Action and Effect

According to the above embodiment, the following operational effects are obtained. Specifically, according to the UE 200, the retransmission function of the Msg3PUSCH can be introduced into the existing RACH procedure, and the RACH procedure having the Msg3PUSCH retransmission function can be realized.

Further, according to the UE 200, when RACH to which the MSG3PUSCH Repetition function is introduced fails, RA-report including information on the Repetition of the MSG3PUSCH, such as rsrp-ThresholdSSB for MSG PUSCH Repetition, can be reported to the network. Thus, the network can optimize the adjustment of parameters associated with the RACH.

(5) Other embodiments

The present invention has been described above by way of examples, but the present invention is not limited to these descriptions, and various modifications and improvements can be made as will be apparent to those skilled in the art.

For example, although the above embodiment has been described with respect to the Repetition of Msg3 and PUSCH, the above-described operation with respect to Repetition may be applied to a message in RACH or other uplink channels.

The PUSCH may be referred to as a physical uplink shared channel, and may not be necessarily PUSCH as long as it is a channel (physical channel) shared by a plurality of UEs 200 (users) in UL. Further, as described above, the present invention can be applied not only to Msg3 but also to other RACH related messages, for example, msg.a for 2-step RACH (which can be interpreted as contention free random access procedure (CFRA)), msg.1, and the like. Can also be respectively interpreted as Msg 1-PRACH preamble, msg 2-RAR (PDCCH/PDSCH), msg3 (PUSCH), and Msg 4-Contention Resolution (PDCCH/PDSCH).

In the above description, the settings (configuration), activation (update), instruction (indicate), activation (enable), designation (specific), and selection (select) may be replaced with each other. Similarly, links (links), associations (associate), correspondences (correspond), mappings (maps), configurations (allocation), assignments (monitor), mappings, and alternatives may be used.

Further, specific, dedicated, UE-specific, and UE-specific may be replaced with each other. Also common, shared, group-common, UE shared may be replaced with each other.

In this disclosure, terms such as "precoding", "precoder", "weight", "virtual Co-location", "transmission configuration indication state (Transmission Configuration Indication state: TCI state)", "spatial relationship", "spatial domain filter (spatial domain filter)", "transmit power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

The block diagram (fig. 3) used in the description of the above embodiment shows blocks in units of functions. These functional blocks (structures) are realized by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically combined, or may be realized by directly or indirectly (for example, by using a wire, a wireless, or the like) connecting two or more devices physically or logically separated from each other, and using these plural devices. The functional blocks may also be implemented by combining software with the above-described device or devices.

Functionally, but not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notifying), communication (communicating), forwarding (forwarding), configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), and the like. For example, a functional block (configuration unit) that causes transmission to function is called a transmission unit (TRANSMITTING UNIT) or a transmitter (transmitter). In short, the implementation method is not particularly limited as described above.

The above-described gNB 100 and UE 200 (the apparatus) may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of a hardware configuration of the apparatus. As shown in fig. 9, the device may be configured as a computer device including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the following description, the term "means" may be replaced with "circuit", "device", "unit", or the like. The hardware configuration of the apparatus may be configured to include one or more of the illustrated apparatuses, or may be configured to include no part of the apparatus.

The functional blocks of the apparatus (see fig. 3) are realized by any hardware elements or a combination of the hardware elements in the computer apparatus.

In addition, each function in the device is realized by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs an operation to control communication by the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the memory 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes accordingly. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. In addition, although the above-described various processes are described as being executed by one processor 1001, the above-described various processes may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be mounted by more than one chip. In addition, the program may also be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and may be configured of at least one of a Read Only Memory (ROM), an erasable programmable read only memory (Erasable Programmable ROM:eprom), an electrically erasable programmable read only memory (ELECTRICALLY ERASABLE PROGRAMMABLE ROM:eeprom), and a random access memory (Random Access Memory:ram), for example. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like capable of executing the methods according to one embodiment of the present disclosure.

The memory 1003 is a computer-readable recording medium, and may be configured of at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a Floppy disk, a magneto-optical disk (for example, a Compact Disc, a digital versatile Disc, a Blu-ray (registered trademark) Disc), a smart card, a flash memory (for example, a card, a stick, a Key drive), a pivotable (registered trademark) Disc, a magnetic stripe, and the like. Memory 1003 may also be referred to as secondary storage. The recording medium may be, for example, a database including at least one of the memory 1002 and the storage 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example.

The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplexing (Frequency Division Duplex: FDD) and time division duplexing (Time Division Duplex: TDD).

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using a different bus for each device.

The device may be configured to include hardware such as a microprocessor, a digital signal processor (DIGITAL SIGNAL processor: DSP), an application specific integrated circuit (application SPECIFIC INTEGRATED circuit: ASIC), a programmable logic device (Programmable Logic Device: PLD), a field programmable gate array (Field Programmable GATE ARRAY: FPGA), or the like, and part or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

Further, the notification of the information is not limited to the form/embodiment described in the present disclosure, and may be performed using other methods. For example, the notification of the information may be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI)), higher layer signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (master information block (Master Information Block: MIB), system information block (System Information Block: SIB)), other signals, or a combination thereof.

The various forms/embodiments described in the present disclosure may also be applied to at least one of long term evolution (Long Term Evolution: LTE), LTE-advanced (LTE-A), upper 3G, IMT-advanced, fourth generation mobile communication system (4th generation mobile communication system:4G), fifth generation mobile communication system (5th generation mobile communication system:5G), future wireless access (Future Radio Access: FRA), new air interface (new radio: NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, ultra mobile broadband (Ultra Mobile Broadband: UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, ultra wideband (ultra-WideBand: UWB), bluetooth (registered trademark), A system using other suitable systems, and A next generation system extended accordingly. Further, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be applied in combination.

The processing procedure, sequence, flow, and the like of each form/embodiment described in the present disclosure can be replaced without contradiction. For example, for the methods described in this disclosure, elements of the various steps are presented using an illustrated order, but are not limited to the particular order presented.

The specific actions performed by the base station in the present disclosure are sometimes performed by its upper node (upper node) as the case may be. In a network composed of one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes (for example, MME or S-GW, etc. are considered, but not limited thereto) other than the base station. In the above, the case where one other network node other than the base station is illustrated, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Or may be input or output via a plurality of network nodes.

The input or output information may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input or output information may be rewritten, updated, or written. The outputted information may also be deleted. The entered information may also be sent to other devices.

The determination may be performed by a value (0 or 1) represented by 1 bit, may be performed by a Boolean value (true or false), or may be performed by a comparison of values (e.g., a comparison with a predetermined value).

The various forms and embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Note that the notification of the predetermined information (for example, the notification of "X") is not limited to being explicitly performed, and may be performed implicitly (for example, the notification of the predetermined information is not performed).

With respect to software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to mean a command, a set of commands, code, a code segment, program code, a program (program), a subroutine, a software module, an application, a software package, a routine (subroutine), an object, an executable, a thread of execution, a procedure, a function, or the like.

In addition, software, commands, information, etc. may be transmitted and received via a transmission medium. For example, where software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (Digital Subscriber Line: DSL), etc.) and wireless technology (infrared, microwave, etc.), the at least one of the wired and wireless technologies are included in the definition of transmission medium.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). In addition, the signal may also be a message. In addition, the component carrier (Component Carrier:CC) may also be referred to as carrier frequency, cell, frequency carrier, etc.

The terms "system" and "network" as used in this disclosure may be used interchangeably.

In addition, information, parameters, and the like described in this disclosure may be expressed using absolute values, relative values to predetermined values, or other information corresponding thereto. For example, radio resources may also be indicated by an index.

The names used for the above parameters are non-limiting in any respect. Further, the numerical formulas and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by all appropriate names, and thus the various names assigned to these various channels and information elements are non-limiting in any respect.

In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gndeb (gNB)", "access point", "transmission point (transmission point)", "reception point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like may be used interchangeably. The terms macrocell, microcell, femtocell, picocell, and the like are also sometimes used to refer to a base station.

A base station can accommodate one or more (e.g., three) cells (also referred to as sectors). In the case of a base station accommodating multiple cells, the coverage area of the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station (Remote Radio Head (remote radio head): RRH) for indoor use).

The term "cell" or "sector" refers to a part or the whole of a coverage area of at least one of a base station and a base station subsystem that perform communication services within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (UE)", "User Equipment (UE)", and "terminal" may be used interchangeably.

For mobile stations, those skilled in the art are sometimes referred to by the following terms: a subscriber station, mobile unit (mobile unit), subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., an automobile, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle, an autopilot, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an internet of things (Internet of Things: ioT) device of a sensor or the like.

In addition, the base station in the present disclosure may be replaced with a mobile station (user terminal, the same applies hereinafter). For example, various forms/embodiments of the present disclosure may also be applied with respect to a structure in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (e.g., may also be referred to as Device-to-Device (D2D), vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have a function of the base station. Further, the terms "upstream" and "downstream" may be replaced with terms (e.g., "side") corresponding to the inter-terminal communication. For example, the uplink channel, the downlink channel, etc. may be replaced by a side channel (SIDE CHANNEL).

Likewise, the mobile station in the present disclosure may be replaced with a base station. In this case, the base station may have a function of the mobile station.

A radio frame may be made up of one or more frames in the time domain.

In the time domain, one or more of the frames may be referred to as subframes. A subframe may further be composed of one or more slots in the time domain.

The subframe may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a subcarrier spacing (SubCarrier Spacing: SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission time interval (Transmission TIME INTERVAL: TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in a frequency domain, a specific windowing process performed by the transceiver in a time domain, and the like.

A slot may be formed in the time domain from one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing: OFDM) symbols, single carrier frequency division multiple access (SINGLE CARRIER Frequency Division Multiple Access: SC-FDMA) symbols, etc.). A slot may be a unit of time based on a set of parameters.

A slot may contain multiple mini-slots. Each mini-slot may be made up of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in units of time greater than the mini-slot may be referred to as PDSCH (or PUSCH) mapping type (type) a. PDSCH (or PUSCH) transmitted using mini-slots may be referred to as PDSCH (or PUSCH) mapping type (type) B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may each use corresponding other designations.

For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini slot may also be referred to as TTIs. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (e.g., 1-13 symbols) shorter than 1ms, or may be a period longer than 1 ms. In addition, a unit indicating a TTI may be called a slot, a mini-slot, or the like, instead of a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for allocating radio resources (bandwidth, transmission power, and the like that can be used for each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., number of symbols) in which a transport block, a code block, a codeword, etc. is actually mapped may be shorter than the TTI.

In addition, in the case where 1 slot or 1 mini slot is referred to as a TTI, more than one TTI (i.e., more than one slot or more than one mini slot) may constitute a minimum time unit of scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of the schedule can be controlled.

A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), normal TTI (normal TTI), long TTI (long TTI), normal subframe (normal subframe), long (long) subframe, slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a shortened TTI (short TTI), a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, for long TTIs (long TTIs) (e.g., normal TTIs, subframes, etc.), a TTI having a time length exceeding 1ms can be substituted, and for short TTI (short TTI) (e.g., shortened TTI, etc.), a TTI having a TTI length less than the long TTI (long TTI) and having a TTI length above 1ms can be substituted.

A Resource Block (RB) is a resource allocation unit of a time domain and a frequency domain, in which one or more consecutive subcarriers (subcarriers) may be included. The number of subcarriers contained in the RB may be the same regardless of the parameter set, for example, 12. The number of subcarriers included in the RB may also be determined according to the parameter set.

Further, the time domain of the RB may contain one or more symbols, and may be 1 slot, 1 mini slot, 1 subframe, or 1TTI in length. A 1TTI, a 1 subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (sub-carrier groups: SCGs), resource element groups (Resource Element Group: REGs), PRB pairs, RB peering.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

The bandwidth part (bandwidth part: BWP) (may also be referred to as partial bandwidth, etc.) may represent a subset of consecutive common rbs (common resource blocks: common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may be determined by an index of the RB with reference to a common reference point of the carrier. PRBs may be defined in a certain BWP and numbered within the BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWP may be set for the UE within the 1 carrier.

At least one of the set BWP may be active, and a case where the UE transmits and receives a predetermined signal/channel outside the active BWP may not be envisaged. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structure of the radio frame, subframe, slot, mini slot, symbol, etc. described above is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like may be variously changed.

The terms "connected," "coupled," or any variation of these terms are intended to refer to any direct or indirect connection or coupling between two or more elements, including the case where one or more intervening elements may be present between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination of these. For example, "connection" may be replaced with "Access". As used in this disclosure, two elements may be considered to be "connected" or "joined" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) region.

The reference signal may be simply referred to as REFERENCE SIGNAL (RS) or Pilot (Pilot) depending on the standard applied.

As used in this disclosure, the recitation of "according to" is not intended to mean "according to" unless explicitly recited otherwise. In other words, the term "according to" means "according to only" and "according to at least" both.

The "unit" in the configuration of each device may be replaced with "part", "circuit", "device", or the like.

Any reference to elements referred to using "1 st", "2 nd", etc. as used in this disclosure also does not entirely define the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to elements 1 and 2 do not indicate that only two elements can be taken herein or that in any form element 1 must precede element 2.

Where the terms "include", "comprising" and variations thereof are used in this disclosure, these terms are intended to be inclusive in the same sense as the term "comprising". Also, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, for example, where an article is added by translation as in a, an, and the in english, the present disclosure may also include a case where a noun following the article is in plural.

The terms "determining" and "determining" used in the present disclosure may include various operations. The "judgment" and "determination" may include, for example, a matter in which judgment (judging), calculation (computing), processing (processing), derivation (deriving), investigation (INVESTIGATING), searching (looking up, search, inquiry) (for example, searching in a table, database, or other data structure), and confirmation (ASCERTAINING) are regarded as a matter in which "judgment" and "determination" are performed. Further, "determining" and "deciding" may include a matter in which reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), and access (accessing) (e.g., access of data in a memory) are performed as a matter in which "determining" and "deciding" are performed. Further, "determining" or "determining" may include the matters of making a decision (resolving), selecting (selecting), selecting (choosing), establishing (establishing), comparing (comparing), and the like as matters of making a "determination" or "determining". That is, the terms "determine" and "determining" may include what is considered to be any action. The "judgment (decision)" may be replaced by "imagine (assuming)", "expect (expecting)", "consider (considering)", or the like.

In the present disclosure, the term "a and B are different" may also mean that "a and B are different from each other". In addition, the term may mean that "a and B are different from C, respectively. The terms "separate," coupled, "and the like may also be construed as" different.

The present disclosure has been described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and not in any limiting sense.

Description of the reference numerals

10. Wireless communication system

20 NG-RAN

100 gNB

200 UE

210. Radio signal transmitting/receiving unit

220. Amplifier part

230. Modulation/demodulation unit

240. Control signal/reference signal processing unit

250. Encoding/decoding unit

260. Data transmitting/receiving unit

270. Control unit

1001. Processor and method for controlling the same

1002. Memory

1003. Memory device

1004. Communication device

1005. Input device

1006. Output device

1007. A bus.

Claims (5)

1. A terminal, wherein the terminal has:

A transmitting unit that repeatedly transmits a message during random access channel; and

And a control unit that sets a random access resource according to whether or not the repeated transmission is applied and a quality threshold for the repeated transmission.

2. The terminal of claim 1, wherein,

The control unit sets the random access resource according to whether the random access channel procedure is 2 or 4 steps.

3. A terminal, wherein the terminal has:

A transmitting unit that repeatedly transmits a message during random access channel; and

And a control unit configured to generate a random access report including information on the quality threshold for repeated transmission when the random access channel procedure fails during the repeated transmission.

4. A wireless communication method, wherein the wireless communication method comprises the steps of:

Repeatedly sending information in the random access channel process; and

The random access resource is set according to whether the repeated transmission is applied or not and the quality threshold for the repeated transmission is applied.

5. A wireless communication method, wherein the wireless communication method comprises the steps of:

Repeatedly sending information in the random access channel process; and

When the random access channel procedure fails during the repeated transmission, a random access report including information on a quality threshold for the repeated transmission is generated.